Broach mechanism



Feb. 28, 1928. 1,660,813

J. L. PERKENS ET AL.

BROACH MECHANISM Filed April 7, 1927 fYQZ 56 50 27 INVENTORS.

Mam,

ATTORNEY leasing "means means each time said reciprocating member Patented Feb. 28, 1928;.

v Leeann JULIAN L. BERKINS, orwnsr SPRINGFIELD, Ann HIRAEE n. CROFT, or SPRINGFIELD,

MASSACHUSETTS, ASsIs-nons Torn-Ennis CHINE ANDGEARCOMPANY, or PRINGFIELD, MAsSAonusnTTs; A coercerron or MASSACHUSETTS.

BaoAcir MECHANISM.

Application filed April 7; 1927. seriaino, 181,843.

Our invention relates to improvementsdn;

mechanisms for automatically changing-the positions of reciprocating broaches, resides in a reciprocating member, a rotatable 'broach holder-carried by said member lock-- ing and releasing means intermittently to impart rotary motion to said holder, rotating means for said holder, means sequentially to operate automatically said locking and re-. and the holder-rotating approaches either end of its travel, together with such other parts-and JEIIlbGPS as may.

be necessary or desirable in order to render the mechanism complete and serviceable in every respect all as hereinafter Set forth.

The primary object of our-inventionis to provide comparatively simple, yet'strong, durable, and highly efiicient mechanism for automatically operating a. holder for two or more 'bFOElClIQS or lines of broachesto:

accurate in its operation.

bring them'alternately into broaching position or the cutting field, to the end that the cutting or breaching operation is practically continuous, that is to say, when the broaches or the lines of'broaclies descend one makes a cut, and when they ascend another makes a cut, and the operation of broaching is thereby materially acceleratechand the production of the machine equipped with our mechanism correspondingly increased.

Another object is to produce a mechanism of this character which is positive and Other objects and advantages will appear in the course of the following description. This mechanism is designed to be incorporat-ed in broaching machinesof the type disclosed in Letters Patent of the United withthe closely associated parts and members of a broaching machine; Fig. 2, a lefthand side elevation ofsaid mechanism and said parts and members, with portions broken out'and brokenaway; Fig. 3,21. front elevationaof said i'nechanisn'i, or enough off the same to show the disposition thereof when thebroach-holder is at the upper end'fia of its travel Fig. t, asimilar'view showing the disposition or the mechanism when said holder is at the lower. endof its travel; Fig. 5, a cross sectionthrough, portions "of said mechanism, taken on lines 5-5, looking down, in Fig. 6, and, Fig. 6 a vertical section through the mechanisnntaken on lines 66', looking in the direction ofthe associated arrow, in Fig. 3.

Similar reference characters j designatesimilar parts throughout the several'views."

Theoldparts and members shown in connection herewith as necessaryfor a complete understanding ofthe present invention com- I prise a column 1, a ranr2arranged to recip rocate vertically on said column, and pro yidedon one side with a, Track 3, anda pin- 1011 l nter-meshing with saidrack, said pin ion being mounted oir'a shaft 7. From any suitable source of motive power the shaft 7 i is caused to rotate, and, through the mediumof the pinion 4 and the rack 8, toactu ate the ram 2'onithe'column"1.. liteversing means for the shaft 7, and means to bring" ab'outth-e operationof said reversing means each time the "ram 2 arrives at either endof its travelare required, but these are not;

shown. because" tliexnature of the same is well understood. In this connection, however, referencemay be had to the aforesaid g patent.

Broaches such as'are used in this art are usually inade'up in sections arranged end to end, so that the separate sections" or 'indi;

vidual broaches, to all intentsand purposes, 9o

form one broach, and theywill herein be so considered Two breaches ofthis character are represented at 8 and 9', respectively, the broach 8 having teeth to cut on the down stroke and the broach 9 having teeth to. cut

onthe up stroke. v

A vertical, cylindrical holder 10 is provided for-the broaches 8 and 9.' Thisholder has along trunnion 11 at the top "and a short :I trunnion 1 2 at the bottom, and said'trunnions are journa-led'in upper and underbeala .ings'13 secured by bolts or other means to the face of'the ram 2, said holder fittingbetween adjacent sides of said bearings.

There are longitudinalislots 14: in opposite 'l05 sides'of the holder 10 to receive the bro'aches 8 and 9'. Each slot 14 also receives,in addition to one of the breaches, abutment blocks at the top and bottom, and an intermediate wedge bar 16. Each broach fits in be-' tween the abutment blocks '15 in the slot'14 in which said breach is located, and one of the wedge bars 16 fits into said slot between said blocks above and below and between the broach and one side of said slot, laterally.

The breaches 8 and 9 have dove-tailedbodies,

and the sides of the slots 14 and of the bars 16 which are contiguous with said bodies are undercut to engage the same andhold the broachessecurely in place, all in the usual The abutment and well known manner. blocks 15 and thewedge bars 16 are secured in the slots 14 in, the holder 10 by screws or othernieans, so thatthey can be removed and changed for other blocks and bars need ed for broaches'v of different lengths or widths, or both.

' plates-25f and 26. 7

side edges of all of these cam plates are in the same vertical plane. Each of the cam.

An upright 17 is located at the leftof the rain 2, has a rearwardlyextending flange 18 that is bolted at 19 to thecolumn 1, and has its lower end bolted at 20 to a fixed part 21 of the frame of, the machine. The flange 18 r is intermediate of the ends of the upright- Secured by screws or other means to the 111- ner or right-handedge of the upright 17 are two fixed earns or dogs 22. The upper end of each dog inclines from the left downwardly to the right, and the lower end of eachdog 22 inclines from the left upwardly to the right. 'Secured by screws or other means to the face of the upright 17 adjacent to its upper end is a cam .plate 23, and similarly secured 'to said face of said upright and the back sides of said plates are'in the same vertical plane. A triangular camv plate 25. is secured by screws or other means to the face of the upright-17 adjacent to.

the cam plate 23, and a like cam plate 26 is similarly secured to said upright adjacent to the cam plate 24. Adjacent inclined edges of the cam plates 23 and 24 are parallel, so, also are adjacent inclined edges of the cam The outer or left-hand .plates 25 and 26 is cut out to accommodate 'a dog 27 which is pivotally connected at 28 with its plate, and to receive a spring 29. The spring 29'has one end fastened to the cain plate 25 (or 26 and the other end attached to. the adjacent end of the dog 27 'which is pivoted to said plate, and normally retains said dog with the outer terminal projecting to the left beyond the left-hand edge of the plate, the dog, when in this normal position, bearing with theaforesaid' end against a part ofthe plate which forms. a stop therefor, asrepresented at 30. When the upper dog is disposed in the aforesaid end of said dog forms a continuation or is in the same plane with the lower inclined edge of the cam plate 25., and when the lower dog 27 is likewise disposed the upper end of the same forms a continuation of or is inthe same plane with the upper inclined edge of the cam plate 26.

.Mounted on and secured to the trunnion 11, directly above the upper bearing 13, is a a pinion 31. Pivotally connected at 32 with 70' normal position by the spring 2 9,the lower a lug 33 onthe hub of the pinion 31 is a pawl 34. Mounted on and secured to the trunnion 11 above the pinion is a lock collar.

vThe collar 35 has a flanged-part in 5- which are oppositely disposed radial notches 36. The collar 35, below the aforesaid flanged part thereof is serrated to form a ratchet 37 adapted by construction andposition to be engaged by the pawl 34. By

means of'the ratchet 37 .and the pawl 34 a the collar'35 is prevented from being r0 tated tothe left; A spring 38 has one terminal attached to the lug 33- and-the other terminal bears on the pawl 34 in a manner to retain said pawl in engagement with the ratchet 37. i

A bar 39 is bolted or otherwise secured to the top of the ram 2, and the front side of said bar is undercut, asrepresented at 40, to form a guide for a horizontal rack bar 41,

said bar'being transversely arranged on the top of said ram and extending, forwardly onto the top of the holder 10, and project ing to the left beyond the ram. Therack bar 41 is provided at the outer end on; the back side with a roll 42.] The roll 42 is located in position to engage the cam plates 23, 24, 25, and 26, and is of a size which enables the same to pass through the channels be I} tween the .camplates 23 and 25, and the channel between the cam plates 24 and 26.

At the left-handend of the bar39 is a bracket 43 which' extends above the top ofv said bar. At the top of'the bracket .43, and parallel with the plane of the front side of the ram 2, is a socket 444 for a horizontal plunger and a spring 46. Tapped into the outer end of the socket 44 is a. plug 47.

The plunger 45 has an extension or spindle 48 that extends to the left and out through the plug 47. The spring 46 is interposed.

between the plug 47 and the plunger 45, encircling the I spindle 48. a p is located by the socket 44 in the same plane with the axis of the collar 35, and is adapted to enter either of the notches 36 in said;

collar, and thus lock the collar and the parts and members controlled thereby against rotation. In the top and longitudinal center The plunger 45 ea ers of-the socket 44-is a slot 49 extendingflength wise of said socket;

Pivotally connected at 150, intermediateiof its-ends, with the bracket 43is ailever: 51'. The lever 51 is, ontop of the bracket::43, extendsrearwardly from the socket44 and has therein adjacent 'to'each terminal thereof a longitudinallyextending slot 52. Theforward terminal otth'e lever 51 is over theslot 49in the socket 44. A pin 53 has'its lower" end set in the plunger 45, and extends up wardly through the slot '49 in the-socket44 and the forward slot 52.in the lever 51.

A slot 54'is providedin the bracket 43,- back of and parallel withthe socket 44, w

receive a plunger 55, and a pin 56 extends upwardlytherefrom through the rear slot 52 in the lever 51. The plunger is heldlin place in the slot 54 by means of a plate 57 thatis'secured ,by screws or other means to theztop of the bracket 43. The plunger 55 is provided at the outer terminal with a roll 58. The roll 58 is positioned by the plunger 55 in the path of the dogs 22.

In each bearing 13 is a vertical passage 59? opening through the side of said bearing 60: In Fig. S-partsare brokenaway to show' The pins 60 and the recesses 62 are so located relative to at 62 three of these recesses;

each other and to the plunger 45 and the notches 36, that said pins holdthe bearing 10 against rotation at the time, said :plunger .is momentarily disengaged from the collar 35, as WilYhereinaftermOre clearly appear.

a The springs-61 are between theinner ends of'the pins 60 and the inner ends of the pas-- sages 59 in the bearings'13, and thus retain said pins in contact with the'bearingflO and in two of the recesses -62when they are in line with saidpins; Thesprings 61 yield," however, and permit the pins 60 to be forced I inwardly when the holder 10 is rotatedf 'VVhen the parts and members are disposed as shown'in Figs. 1, 2, 3, 5,"and 6, the broach' 8 is located in the cutting field-and about to,

becarried down through the same by the ram 2. The holder 10 is locked with the breach 8 in the position just notedby' means of the' plunger 45, and the roll 42 is in contact with the left-handor outer edge of the cam plate 23. Starting with the parts and members thus disposed, the complete operation of the mechanism'is' described as fol lows As'the ram '2'descends'and thebroach 8* p the dog 22', andftheiholder 10 is locked by makes its out, the roll'42' is carried with said ram, and on thewayz'after leavingf'the' outer edge ot'the cam plate 23', passes in contact'with the outer edge of the cam plate 25, encounters the upper dog 27 and momen In each end ofthe holder 10 are tarily rocks'the same @on itspivota28, against: the resiliency of the attached spring 29,:outi of the way, and continues J downward auntil said roll encounters the lowerfidog- '27.

In (descending, the ram 2 not only-carries"- downwardly with it. the rack bar 41 which is provided" with the roll' 42, but also} the plunger: 55 which isprovided with the rollfl 58,- and: saidroll first" enc ounters'the upper} 'dog' 22 and'is reciprocatedthereby; The re ciprocationof the plunger 55 rocks the lever- 51fon its pivot'50, through the medium of f the'pin 56, first in the direction towithdra-W the plunger45 from engagementwith-the collar 35, against the resiliency of the spring 46, and then in the direction to permit sai Spring to restore said plunger to engagement I with said collar, through the medium of the pin 53. During-this momentary release of the collar ,35 and therefore of theholder 10, said holder is held againstrotation bytlie pins 60*which are in two of therecesses-62i As the rain 2 continues on its downward course,and after the broach 8 has'completed' its'cut, the roll 58en'countersthe lower dog 22 and momentarily unlocks the holder- 10, in

the manner just described, and during-this", time the roll 42',ha-ving arrivedat-thelower dog 27, rides downwardly and inwardlyvonsaid-dogandjon the cam plate 26 until said roll'passes ofi' of saidplate' intothechannel between the same and the cam plate 24." H1, 7

the rackbar 41 and one-half of a'revolution to the right is imparted to the holder '10,- through the medium of said bar, the pinion lution isthus imparted'to the holder 10, vit

forces downwardly the pin's'60, against the resiliency oflthe springsu61, until the other two recesses 62'ar'e' brought 'intolinewith intosaid recesses. v V H The roll 42 is carried: downwardly an said pins, when said springs force said e fl 1m olution tothe pinion 31 in the opposite direction to whichsaid pinion'iwas previously actuated, but this time the movement-is nottransmitted to the holder 10, because the moving inwardly the roll-42 carries withit' outwardly throughthe channel between the cam plates '24 and26, bythe ram 21in its further downward movement, untilisaid roll bearsagainstthe left-hand or'out'er edge of i said first-named cam plate, as shown in'Fig 4. Therack bar.v 41 i s thus' actuated out-f wardly again, and imparts one-half of a revpawl 34 passes'idly over tthe ratchet 37. Be-:'*

fore the roll'v42 'entersfthe channel-between the cam plates 24and"26.'the 'roll58fclears the" plunger 45, said plunger this time being. 1

was

now corresponds with that illustrated in Fig. 4:;

' to ascend.

As soon as the roll l2'rides onto the outer edge of the cam plateQ l, the direct on of ,theram is changed, and said ram commences In ascending the ram carries 7 the rack bar i-l and the plunger 55 upwardly, the roll 42 passes from the outer edge otthe camplate 24 to the outer edge of the cam- .plate 26,. rocks the lower :dog 27 out of the 'way and continues upwardly until-it arrives lvIea'nwhile the roll, 58 encounters the lower dog 22. and moat the upper dog 27.

mentarily unlocks the-holder 10, but the same is held against rotation bythe pins 60, By the time the roll 42 encounters the upper dog 27, the roll 58 has encountered the upper dog 22, and the breach S h-as completed its out. The roll 58 in passing over the upper dog 22brings about the- ,unlocking of the holder 10, and the roll rides upwardly and inwardly on the end of the upper dog 27 and the aligning edge otthe cam plate 25. In'moving inwardly the roll 42 again actuates the rack bar 41 inwardly and in the direction to cause to be imparted another half revolution to the holder 10, whereby the broach 9 is moved out of and the breach 8 is again moved into the cuttingfield, and the holder 10 is relocked as soon as the roll 58 rides oif of the upper dog 22." The roll 42,

inpassing into the channel between the cam plates 23 and 25 and through the same onto the outer edge of said first-named cam plate,

carries therack bar 41 outwardly again, but the pawl 34 elicks'over the ratchet 37' and the holder 10 is not affected. The mechanism is now ready for the next and immediately of the parts" of this mechanism in addition to those hereinbefore directly or indirectly noted, maybe made, without departing from the spirit of our invention, or exceeding the scope o'fjwhat is claimed.

VVhatwe claim as our invention, and d esire to secure by Letters Patent, is- V 1. In mechanism of the class described, a

reciprocating member, a breach holder car- IlGdyb-y said member and'rotatable thereon in one direction only, and automatic means intermittently to rotate said holder.

2. In mechanism of the class described,

'meshes with said rack bar.

a reciprocating member, a broach holder carried by said member and rotatable thereon' in one direction only, means to lock and release said: holder, and means partially to ro-.

tate said holder while unlocked.

3.. In mechanism of they class described, a

reciprocating member, a broach holder carriedby said member and rotatable thereon in one direction only, yielding means normally retaining said holder against rotation, and intermittently operating means partially to rotate said holder.

4. In mechanism of the class described, a reciprocating member, a breach holder'carried by said member and rotatable thereon l in one direction only, means positively to ing means out otlocking position. and intermittently operating means partially torotate said holder, when unlocked against the resistance of said yielding means. 1

5.' In mechanismof the. class described, a reciprocating member, a broach holder carried by said member and rotatable thereon in one direction only, yielding means preventing said holder from rotating, means .89 lock said holner against rotation, intermittentlyoperatlng'means to actuate said lockpositively to lock said holder against rota tion, intermittently operating means to actu ate said lockingmeans out of locking position, and intermittently operating means partially to rotate said holder,rwhen unlocked, against the resistance of said yield- 111g means.

(5. In mechanism of the class described, a

reciprocating member, a. rotatable broach holder carried by said member, means to actuate said holder on its axis in one direcmeans to operate each time said reciprocating member approacheseither end, of its travel. 7 V r v V 7 In mechanism of the class described, a reciprocating member a rotatable broach holder carried by said member, reciprocating means adapted to impart a rotary motion to said holder in'one direction, when said reciprocating. means is actuatedin one direction, and means to prevent said rec1p-, l rocating means, whenmoved 1n the opposite direction, from acting on said holder.

8. The combination, in mechanismof the class described, with a reciprocating member provided. with a rack bar having a pro- -jecti,on,'and cam plates in the path of said projection adj accnt to each end of the move mentimparted thereto bysaid reciprocating member, whereby said projection is moved-to reciprocate said bar, of a breach holder mounted on said reciprocating member, and provided with a pinion which inter- 9. The combination, in mechanism of the class described, with a reciprocating memtion only, and means to cause said actuating l ill ber, two plungers operatively connected by a lever, one of said plungers having a projection, and dogs in the path of said project-ion, whereby, when said projection encounters said dogs, said plungers are actu- V ated, of a broach holder rotatably mounted on said member, and provided with a notched collar adapted to be engaged by and released from the other of said plungers, and means to impart rotary motion to said holder each time said reciprocating member approaches either end of its'travel.

10. The combination, in mechanism of the class described, with a reciprocating member provided with a rack bar having a projection, and two cam plates in the path of said projection adjacent to each end of the movement imparted thereto by said reciprocating member, certain of said cam'plates being provided with'yielding dogs each of which permits said projection to move in one direction in a straight line, but diverting from said line said projection when moved in the opposite direction, whereby said projection ismoved to reciprocate said bar, of a broach holder mounted on said'reciprocatingv member, and provided with a pinion which inte'rmeshes with said rack bar.

11. The combination, in mechanism of the class described, with a reciprocating member provided with a rack bar having a projection, and two cam plates in the path of said projection adjacent to each end of the movement imparted thereto by said reciprocating member, certain of said cam plates being provided with yielding dogs each of which permits said projection to move in a straight line in one direction, but diverts from said line said projection when moved in the other direction, wherebysaid projection is moved to reciprocate said bar, of

a broach holder mounted on said reciprocating member, and provided with a pinion which intermeshes with said rack bar, and

with a ratchet and pawl to enablesaid rack o without affecting said holder.

bar to be returned to operative position 12. The combination, in mechanism'of the ber provided with a rack bar havingaprojection, and two cam plates in the path of said projection adjacent to each end of the movement imparted thereto by said recipclass described,-with a reciprocating 'mein- I rocating member, certain of saidcam plates being'provided with yielding-dogs eachof which permits said projection to move in a straight line in. one direction, but divertsv from said line said projection when moved:

in the other direction, whereby said projection is moved to reciprocate said bar, ofa

broach holder mounted on said reciprocating member, and provided with a pinion which intermeshes with said rack bar, and with a ratchet and pawl to enable said rack bar to i be returned to operative position without affecting said holder, vand yielding means 7 normally to prevent said holder iromrotating. l 1 V 13.- Thecombination, in mechanism of the class described, with a reciprocating member provided with a reciprocating rack bar having a projection, cam members in the path of said projection at either end ofthe engaged by and released from the other of i said plungers; V

' JULIAN L. PERKINS. I HIRAM CROFT. 

